121121120021 has 8 divisors (see below), whose sum is σ = 132135136704. Its totient is φ = 110107604320.

The previous prime is 121121120009. The next prime is 121121120023. The reversal of 121121120021 is 120021121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121121120021 - 2²² = 121116925717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121119978 and 121121120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528800 + ... + 722406.

It is an arithmetic number, because the mean of its divisors is an integer number (16516892088).

Almost surely, 2^121121120021 is an apocalyptic number.

121121120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121120021 is a deficient number, since it is larger than the sum of its proper divisors (11014016683).

121121120021 is a wasteful number, since it uses less digits than its factorization.

121121120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250491.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121121120021 its reverse (120021121121), we get a palindrome (241142241142).

It can be divided in two parts, 121121 and 120021, that added together give a palindrome (241142).

The spelling of 121121120021 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, twenty-one".